A comparison between magnetic and reflection loss characteristics of substituted strontium ferrite and nanocomposites of ferrite/carbon nanotubes

2012 ◽  
Vol 111 (7) ◽  
pp. 07B543 ◽  
Author(s):  
Ali Ghasemi ◽  
Sagar E. Shirsath ◽  
Xiaoxi Liu ◽  
Akimitsu Morisako
Keyword(s):  
Carbon Nanotubes ◽  
Reflection Loss ◽  
Strontium Ferrite

scholarly journals Structural, microstructural, magnetic and electromagnetic absorption properties of spiraled multiwalled carbon nanotubes/barium hexaferrite (MWCNTs/BaFe12O19) hybrid

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Nurshahiera Rosdi ◽  
Raba’ah Syahidah Azis ◽  
Ismayadi Ismail ◽  
Nurhidayaty Mokhtar ◽  
Muhammad Misbah Muhammad Zulkimi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Absorption ◽  
Multiwalled Carbon Nanotubes ◽  
Reflection Loss ◽  
Barium Hexaferrite ◽  
High Energy ◽  
Absorption Properties ◽  
Multiwalled Carbon ◽  
Absorption Bandwidth ◽  
Minimum Reflection Loss

AbstractMicrowave absorption properties were systematically studied for synthesised barium hexaferrite (BaFe12O19) nanoparticles and spiraled multiwalled carbon nanotubes (MWCNTs) hybrid. BaFe12O19 nanoparticles were synthesised by a high energy ball milling (HEBM) followed by sintering at 1400 °C and structural, electromagnetic and microwave characteristics have been scrutinized thoroughly. The sintered powders were then used as a catalyst to synthesise spiraled MWCNTs/BaFe12O19 hybrid via the chemical vapour deposition (CVD) process. The materials were then incorporated into epoxy resin to fabricate single-layer composite structures with a thickness of 2 mm. The composite of BaFe12O19 nanoparticles showed a minimum reflection loss is − 3.58 dB and no has an absorption bandwidth while the spiraled MWCNTs/BaFe12O19 hybrid showed the highest microwave absorption of more than 99.9%, with a minimum reflection loss of − 43.99 dB and an absorption bandwidth of 2.56 GHz. This indicates that spiraled MWCNTs/BaFe12O19 hybrid is a potential microwave absorber for microwave applications in X and Ku bands.

Electromagnetic Characteristics and Microwave Absorption Properties of CNT Composite

2011 ◽  
Vol 194-196 ◽  
pp. 520-523 ◽  
Author(s):  
Min Zhang ◽  
Hai Yan Zhang ◽  
Guo Xun Zeng
Keyword(s):  
Carbon Nanotubes ◽  
Reflection Loss ◽  
Low Frequency ◽  
Loss Peak ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Permittivity And Permeability ◽  
Electromagnetic Characteristics ◽  
Microwave Permittivity ◽  
Peak Value

The microwave permittivity and permeability of Carbon Nanotubes (CNTs)/paraffin and CNTs-Co(C)/paraffin were measured respectively and their differences were discussed in detail. Furthermore, the reflection losses for double-layer CNTs (CNTs-Co(C))/epoxy coatings, with the thickness ranged from 1.6-2 mm, were practically tested through Arc Method in 2.6-18 GHz frequence range. The results indicated that the reflection loss peak shifted towards low frequency and the peak value decreased with the coating thickening and possible mechanisms for the phenomena were given.

Enhanced microwave absorbing properties of PVP@multi-walled carbon nanotubes/graphene three-dimensional hybrids

RSC Advances ◽  
2015 ◽  
Vol 5 (102) ◽  
pp. 83953-83959 ◽  
Author(s):  
Lichao Ding ◽  
Aibo Zhang ◽  
Honglong Lu ◽  
Yanping Zhang ◽  
Yaping Zheng
Keyword(s):  
Carbon Nanotubes ◽  
Reflection Loss ◽  
Three Dimensional ◽  
Microwave Absorbing Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Microwave Absorbing ◽  
Walled Carbon Nanotubes

Reflection loss of (a) GNPs; (b) MWNTs; (c) PVP@MWNTs/GNPs hybrids.

scholarly journals Nickel Carbon Composite With Carbon Nanotubes for Efficient Electromagnetic Wave Absorption

2020 ◽  
Author(s):  
Yun Qiu ◽  
Haibo Yang ◽  
Liang Ma ◽  
Ying Lin ◽  
Hanwen Zong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Wave ◽  
Reflection Loss ◽  
Carbon Composite ◽  
Hybrid Network ◽  
Hierarchical Architecture ◽  
Mass Ratio ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Metal Organic

Abstract Nickel carbon composite with carbon nanotubes (Ni-C/CNTs) has been fabricated by pyrolysis the mixture of nickel-based metal organic framework (Ni-MOF) and melamine. The resultant Ni-C/CNTs composite is assembled from one-dimensional (1D) CNTs and three dimensional (3D) spherical Ni-C composite. Besides, the Ni-C/CNTs composite contains abundant nitrogen(N) dopants that contributes to defect dipole polarization. The diameter and length of CNTscan beeffected by changing the mass ratio of Ni-MOF and melamine. The optimizedNi-C/CNTs composite exhibits reflection loss of -55.1 dB at 10.56 GHz, and the effective absorbing bandwidth (reflection loss < -10 dB) is 11.2 GHz (6.0-17.2 GHz)with the thickness range of 1.5-4.0 mm, when the mass ratio of Ni-MOF: melamine is 1: 2. These results indicate that the mixed 1D-3D hierarchical architecture synergistically improves electromagnetic wave absorption properties. This strategy willcontribute for fabricating the carbon hybrid network consisting of metal organic frameworks derived metal/carbon hybrid and CNTs for electromagnetic wave absorption.

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